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The Electronic and Optical Properties of Vertically Stacked GaN-WS_(2) Heterostructure

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Journal of Wuhan University of Technology(Materials Science) 2022年第1期37卷 28-31页

作者： ren Dahua QIAN Kai LI Qiang zhang yuan zhang Teng School of Information Engineering Hubei Minzu UniversityEnshi 44500China School of Advanced Materials and Mechatronic Engineering Hubei Minzu UniversityEnshi 44500China

The electronic structure and optical property of stacked GaN-WS_(2)heterostructure are explored with HSE06 calculation based on density functional *** direct band gap of GaN-WS_(2)heterostructure is 1.993 eV,which is obviously a type-II band alignment ***,the optical property of GaN-WS_(2)heterostructure such as absorption coefficient is *** new findings enable GaN-WS_(2)heterostructure to be promising candidates for photovoltaic cells and electronic devices in visible light.

关键词： GaN-WS_(2)heterostructure band structure optical property calculation

O,H,and Sr isotope evidence for origin and mixing processes of the Gudui geothermal system,Himalayas,China

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Geoscience Frontiers 2020年第4期11卷 1175-1187页

作者： Chenguang Wang Mianping Zheng Xuefei zhang Enyuan Xing Jiangyi zhang Jianhong ren yuan Ling MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesCAGSBeijing100037China Hydrochemistry and Environmental Laboratory Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Geological Processes and Mineral Resources China University of Geoscience(Beijing)Beijing100083China

Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's *** about 150 km southeast of Lhasa City,the capital of Tibet,the Gudui geothermal field belongs to the Sangri-Cuona rift belt,also known as the Sangri-Cuona geothermal belt,and is representative of the non-volcanic geothermal systems in the *** this study,oxygen-18 and deuterium isotope compositions as well as 87Sr/86Sr ratios of water samples collected from the Gudui geothermal field were characterized to understand the origin and mixing processes of the geothermal fluids at *** and oxygen isotope plots show both,deep and shallow reservoirs in the Gudui geothermal *** geothermal fluids are the mixing product of magmatic and infiltrating snow-melt *** show that the magma fluid component of the deep geothermal fluids account for about 21.10%-24.04%;magma fluids lay also be a contributing source of *** linear relationship of the 87Sr/86Sr isotopic ratio versus the 1/Sr plot indicates that shallow geothermal fluids form from the mixing of deep geothermal fluids with cold *** a binary mixing model with deep geothermal fluid and cold groundwater as two end-members,the nixing ratios of the latter in most surface hot springs samples were calculated to be between 5% and 10%.Combined with basic geological characteristics,hydrogen and oxygen isotope characteristics,strontium concentration,87Sr/(86)Sr ratios,and the binary mixing model,we infer the 6 th-Class Reservoirs Evolution Conceptual Model(6-CRECM) for the Gudui geothermal *** model represents an idealized summary of the characteristics of the Gudui geothermal field based on our comprehensive understanding of the origin and mixing processes of the geothermal fluid in *** study may aid in identifying the geothermal and geochemical origin of the Gudui high-temperature hydrothermal systems in r

关键词： Geothermal fluid Oxygen-18 and deuterium isotope 87Sr/86Sr ratio Origin and mixing Gudui Himalayas

Numerical Modeling of Microbial Fuel Cell Based on Redox Electron Mediator

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Journal of Harbin Institute of Technology(New series) 2015年第3期22卷 48-56页

作者： yuan yuan Jinna zhang Hong Huang Shijie You Xiaobo Gong Nanqi ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

To investigate the behavior of redox electron mediator and its impact to power generation of microbial fuel cell( MFC),this study carries out the numerical modeling of a typical two-chamber MFC based on assumption of interfacial electron transfer via redox electron mediator and acetate as sole electron donor. The model simulates the development of cell voltage,current,substrate concentration,redox electron mediator concentration,polarization and power density output under defined conditions. The results demonstrate that the developed models can fit the experimental results well on a qualitative basis,and concentration of electron reduced mediator plays a dominant role in electron transfer process,and the mass transfer may constitute the limiting step when its concentration is at a relatively low level. This study not only provides a better understanding of electron redox mediator behavior during power generation,but also suggests a strategy to improve electron transfer in the anode of MFC.

关键词： microbial fuel cell numerical modeling redox electron mediator mass transfer

Importance of plant and bird traits on the seed removal pattern of endangered trees across different forest patches in southeast China

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Ecological Processes 2020年第1期9卷 499-504页

作者： Ning Li Shuai zhang yuan-Hao ren Zheng Wang Institute of Applied Ecology Nanjing Xiaozhuang UniversityNanjing 211171JiangsuChina College of Biology and Environmental Science Nanjing Forestry UniversityNanjing 210037China

Seed removal by birds has been recognized as an important part of seed dispersal process in patchy forest areas;however,few studies have focused on the contribution of both plant and bird traits to seed *** this study,field data of seed removal for Taxus chinensis was combined with the data of bird and plant traits for *** relevant traits of plants and birds that influenced ***-bird interaction were identified in a remnant patchy forest in yew ecological garden,Fujian Province,southeast *** bird species were found to forage and remove the seeds of *** number of bird species varied in different forest patches;however,their contribution to seed removal showed no significant *** bird and plant traits were found to affect seed *** seed removal rate was positively affected by bird traits,such as foraging frequency and wing length,but decreased with body *** plant traits,such as number of fruits,tree height,canopy density,and crown width,which are related to safe shelter and food resource conditions,increased the seed removal *** results underline the functional importance of bird and plant traits in the seed removal from endangered trees in patchy ***,future conservation strategies should prioritize and recognize the role of both plant and bird traits in seed dispersal in remnant patchy forests.

关键词： Seed removal Bird trait Plant trait Hypsipetes leucocephalus Patchy forest

Terahertz Direct Detection Characteristics of a Superconducting NbN Bolometer

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Chinese Physics Letters 2011年第1期28卷 50-53页

作者： ren yuan MIAO Wei YAO Qi-Jun zhang Wen SHI Sheng-Cai Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 Graduate School of the Chinese Academy of Sciences Beijing 100049

We report the terahertz direct detection characteristics of a spiral antenna coupled NbN superconducting hot- electron bolometer （HEB） at a bath temperature of 4.2K. Thermal conductance determined from resistance transition curves with different bias currents is found to be 3 × 10 7 W/K. The device shows a read-out circuit limited noise equivalent power （NEP） of 4.5 × 10-12 W/Hz/2 at 4.2 K with a home-made transimpedance amplifier operating at room temperature.

关键词： Superconductivity Instrumentation and measurement

Evolving a novel red-emitting two-photon dye with optically tunable amino group for monitoring the degree of hypoxia during liver fibrosis

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Chinese Chemical Letters 2023年第5期34卷 480-483页

作者： Xingxing zhang Feiyu Yang Tianbing ren Yingxin Zheng Xiao-Bing zhang Lin yuan State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Two-photon imaging has attracted increasing attention owing to its deep tissue imaging ***,many fluorophores have been developed to satisfy its ***,long-wavelength emission fluorophores with an optically tunable group are rarely *** this study,two longwavelength emission fluorophores with an optically tunable amino group were successfully developed by introducing strong electron acceptor and large conjugated group to the TPQL ***_(2)displayed a bright red emission(λem=638 nm,Φ=0.15)together with high two-photon action cross section and good water solubility,which enabled higher signal-to-background ratios and deep tissue *** proof-of-concept probe(TPCO-NO_(2))was successfully applied to the high signal-to-background ratio imaging of nitroreductase in liver fibrosis,further realizing diagnosis of the degree of hypoxia during liver fibrosis.

关键词： Fluorescent probes Two-photon imaging Fluorophores Nitroreductase Hypoxia

Effect of lanthanum on inclusions in non-oriented electrical steel slabs

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Journal of Iron and Steel Research International 2024年第7期31卷 1680-1691页

作者： Qiang ren Zhi-yuan Hu Yun-xia Liu Wei-cheng zhang Zi-qi Gao Li-feng zhang School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Research and Development Department Shougang Zhixin Qian'an Electromagnetic Material Co.Ltd.Qian'an 064400HebeiChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The effect of lanthanum on the characteristics of inclusions in the slab of non-oriented electrical steels was investigated through industrial trials and thermodynamic *** number,size,and chemical composition of inclusions in the surface,one-quarter of thickness and the center of slabs with and without lanthanum addition were statistically analyzed using an automatic inclusion analysis *** the lanthanum-free slab,inclusions were predominately ***_(2)O_(3),MgO,and AlN as well as a small number of Al_(2)O_(3)-MgO-CaO and *** number densities of oxide inclusions and AlN decreased from the surface to the center of the slab,which was ascribed to the difference in cooling intensity during the continuous *** the steel with lanthanum addition,inclusions were modified into LaAlO_(3) and La_(2)O_(2)S and gradually transformed into dual-phase MgO-La_(2)S3 with an increasing distance from the slab surface due to the reaction between the lanthanum-containing inclusion and the steel *** uneven distribution of oxide inclusions along the thickness of the slab was eliminated in the lanthanum-bearing slab because the dissolved oxygen was remarkably decreased by ***-bearing inclusions were more likely to agglomerate AlN by inducing the heterogeneous nucleation of AlN on their surface,while small-size ***_(2)O_(3) inclusions hardly showed a coarsening effect on the size of AlN.

关键词： Lanthanum-Inclusion Non-oriented electrical steel Aluminum nitride Heterogenous nucleation

Effect of thinning intensity on the carbon sequestration of natural mixed coniferous and broadleaf forests in Xiaoxing'an Mountains, China

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Journal of Forestry Research 2024年第6期35卷 198-209页

作者： Hangfeng Qu Xibin Dong Hui Liu Baoshan zhang Tong Gao yuan Meng Yunze ren Ying zhang Key Laboratory of Sustainable Forest Management and Environmental Microorganism Engineering of Heilongjiang Province Northeast Forestry UniversityHarbin 150040People’s Republic of China Harbin Forestry Machinery Research Institute State Forestry and Grassland AdministrationHarbin 150086People’s Republic of China

To study the effect of thinning intensity on the carbon sequestration by natural mixed coniferous and broad-leaf forests in Xiaoxing’an Mountains,China,we established six 100 m×100 m experimental plots in Dongfanghong For-est that varied in thinning intensity:plot A(10%),B(15%),C(20%),D(25%),E(30%),F(35%),and the control sample area(0%).A principal component analysis was performed using 50 different variables,including species diversity,soil fertility,litter characteristics,canopy structure param-eters,and seedling regeneration *** effects of thinning intensity on carbon sequestration were strongest in plot E(0.75),followed by D(0.63),F(0.50),C(0.48),B(0.22),A(0.11),and the control(0.06).The composite score of plot E was the highest,indicating that the carbon sequestration effect was strongest at a thinning intensity of 30%.These findings provide useful insights that could aid the management of natural mixed coniferous and broadleaf forests in Xiaoxing’an Mountains,*** information has implications for future studies of these forests,and the methods used could aid future ecological assessments of the natural forests in Xiaoxing’an Mountains,China.

关键词： Thinning intensity Xiaoxing’an Mountains China Natural mixed coniferous and broadleaf forest Carbon sequestration

Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan-Lu Fault Zone, China

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 1960-1976页

作者： FU Xiang zhang Dayu YAO Ziwei ren Kangda DENG Yufeng LI Jiahao JIANG ren yuan Feng School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Nanjing Geological Survey Center China Geological SurveyNanjing 210016China

The Feidong district is located in the southern segment of the Tan-Lu fault zone that separates the South China Block(NCB)from the North China Craton(NCC).We report zircon U-Pb geochronology and Hf isotope data,as well as whole-rock geochemistry for Xishanyi granodiorite and Jianshan granite in the Feidong *** U-Pb dating results show that the emplacement ages of the Xishanyi and Jianshan intrusions are 124±3 Ma and 130±1 Ma respectively,coeval with magmatic events linked to large-scale lithospheric thinning in eastern *** whole-rock geochemistry of the Xishanyi and Jianshan intrusions demonstrate that they are peraluminous,high potassium calc-alkaline I-type granites with adakitic *** intrusions underwent weak crustal assimilation during *** in situ zirconε(Hf)(t)values of the Xishanyi granodiorites range from-26.4 to-21.8,with T(DM2)model ages of 2552 to 2841 *** in situ zirconε(Hf)(t)values of the Jianshan granite are from-27.5 to-23.0 with T(DM2)model ages of 2632 to 2904 *** peak age of inherited zircon grains from the Xishanyi granodiorite and the Jianshan granite were^2.07 Ga and^1.94 Ga,*** compared with the regional magmatism,we suggest that both the Xishanyi and Jianshan granitoid intrusions were derived from partial melting of the NCC lower crust.

关键词： Granitoid intrusion Petrogenesis Feidong district Tan-Lu Fault Zone